1. Apple. Apples contain a large amount of sugar and potassium, and excessive intake is not beneficial for heart and kidney health; people with coronary heart disease, myocardial infarction, kidney disease, or diabetes should not eat too many.
2. Banana. Bananas are cold in nature and contain a high amount of sodium. People with chronic nephritis, high blood pressure, or edema should be especially cautious; because of their high sugar content, diabetics should eat them in moderation.
3. Citrus. Citrus fruits are cool in nature, and elderly people with weak spleen, stomach, kidney, or lung function should not eat too many, so as to avoid inducing symptoms like abdominal pain and weakness in the lower back and knees. Eating too many oranges can also easily lead to "heatiness," causing sores at the corners of the mouth, red and swollen eyes, and triggering hemorrhoids. Oranges also contain carotene, and excessive consumption can cause yellow pigmentation of the skin. [China Cuisine]
4. Watermelon. Watermelon has a high water content and is an excellent fruit for relieving summer heat, but its flesh is cold in nature. Elderly or physically weak people who eat too much may easily experience abdominal pain or diarrhea; people with heart failure and those with severe edema should also avoid eating too many.
5. Lychee. Eating lychees continuously in large quantities can cause a pale complexion, dizziness, palpitations, cold sweats, yawning, and fatigue. This is due to exogenous hypoglycemia caused by lychees, a condition medically known as "lychee disease."
6. Persimmon. The flesh of persimmons contains a large amount of tannin and persimmon gum. Tannin has a strong astringent effect, so people with constipation should not eat too many. Additionally, eating persimmons on an empty stomach or after eating crabs can easily cause persimmon stones. Therefore, patients with gastritis, excessive stomach acid, or a weak spleen and stomach, as well as those who are fasting or fatigued, should avoid or eat very few persimmons.